Calculate the open circuit voltage, Electrical Engineering

This question is designed to give you practice in manipulating circuit equations using j notation, and to demonstrate that techniques that you have already studied in the d.c. context can be applied equally successfully to the solution of steady-state a.c. problems.

485_Calculate the open-circuit voltage.png

The sketch (right) shows the approximate equivalent circuit of a real transformer (inside the dotted line) with its parameters referred to the primary side, and with a referred load resistance of 5 ω. Find

(a) the open-circuit voltage VL , and

(b) the voltage across the 5 ω 'referred' load, by the following three methods.

 Method 1: Direct approach. First find the open circuit voltage by simple 'potential divider' approach (but with complex impedances Z replacing the simple resistances we used under d.c. conditions). Then find the equivalent series impedance of the two parallel branches on the right, and again use the 'potential divider' idea to find VL. The calculations are lengthy, and you will probably find it best to use polar form for the multiplications and divisions.

Method 2: Thévenin. Find the Thévenin equivalent circuit for the transformer and 100 V supply. Then apply the load and use the potential divider approach.

Method 3: Nodal Analysis. Call the node at the top of j35 node a and that at the top of the 5 ω load node b, with the reference (zero) node at the bottom. Write down the nodal equations in terms of the complex impedances, and solve for Vb.

Calculate the % change in the output voltage when the load is applied (this is known, as the 'regulation'). What would you expect the regulation to be if the transformer were ideal?

Posted Date: 2/22/2013 2:56:06 AM | Location : United States

Related Discussions:- Calculate the open circuit voltage, Assignment Help, Ask Question on Calculate the open circuit voltage, Get Answer, Expert's Help, Calculate the open circuit voltage Discussions

Write discussion on Calculate the open circuit voltage
Your posts are moderated
Related Questions
Principles for Implementation of Strategy in an Organization Organization required focusing on five principles for the successful implementation of strategy. Organizations wil

Referring to Figure, let boxes 2, 3, and 5 consist of a 0.2-H inductor, a 5- resistor, and a 0.1-F capacitor, respectively. Given A = 5, and v 1 = 10 sin 10t, i 2 = 5 sin 10t ,

What are the modes used in display modes? 1. Left Entry mode In the left entry mode, the data is going into from the left side of the display unit. 2. Right Entry Mode

Hall Effect experiment: Prob. Write short note on Hall Effect and its applications. What properties of a semiconductor are determined from a Hall Effect experiment? Sol.

Q. The flux-density distribution in the air gap of a 60-Hz, two-pole, salient-pole machine is sinusoidal, having an amplitude of 0.6 T. Calculate the instantaneous and rms value

Binary Multiplication Multiplication can be seen as multiple additions. For  example  if we  have to multiple 4 and 8 we can  8, 4  time to get the  solution. Actually this  conc

Define Combinations of logic gates? The Logic gates be able to combined to produce more complex functions. They can as well be combined to substitute one kind of gate for anoth

Q. In a CD amplifier,given Rs =4k?, µ=50 and rd= 35k μ. Find the voltage gain Av. The voltage gain,  A v = Vo / V i = µR s / (µ+1) R s + rd = 50*4* (103 )/ (50+1)*4*103

When recording infrasound waves or microwaves how do they vary from one another? Ans) By microwaves, do you mean "radio signals", like in a microwave oven? These have nothing t

how can i do a question concerning a transfer function